Propeller



April 22 1924. 1,491,729

' 1. NYLANDl-:R

. PROPELLER Filed Abyil 16. 1923 a nut 4 contacting with the rear e'nd ot -by the stepped formation of the Shaft. A`

Patented Apr. 22, 1924.

- UNITED STA T'ES JOHN NYLANDER, OF 'MUSKEGON, MICHIGAN.

1,491329 FICE;

PROPELLER.

Application filed Apx'll16; 19,23. Serial'No. 632,514.

To all whom it may concem:

Be it known that I, JOHN NYLANDER, a citizen of 'the United States,residing at Muskegon, in the county of Muskegon and State of Michigan,have invented certain new and useful Improvements in Propellers; and Ido declare the following to be a full, clear, and exact description ofthe`invention, such as will, enable others skilled in the art to whichit appertains to make and use the same.

My invention relates to improvements in boat propellers and has for oneobject to provide a propeller provided with a novel form of blade whichmay be quickly and easily detached if injured, so that another may beeasily substituted.

A further object is to provide a construc-V tion in which part of theattaching means for the removable blade, acts as a key to preventrelative rotation of the propeller hub and the shaft which. extendstherethrough.

Another object of the invention is to provide a propeller which will notforma vacuum pocket in the water when operating.

With the foregoing in view, the invention resides in the novel subjectmatter hereinafter described and claimed, the description beingsupplemented by theaccompanying drawing.

Figure 1 is a sideelevation of a propeller co'nstructed in accordancewith my invention. V

Flgure 2 is. a sectional -v1ew on line 2-2 of Fig. 1.

Figure 3 is a rear end elevation. Figures 4 and 5 are transversesectional views onlines 41-4 and 5-5 of Fig. 1.

Figure 6 is a longitudinal sectional view as indicated by line 6-6 ofFig. 3.

In the drawing above briefly described, the numeral 1 designates4 an-axially elongated hub which is provided with a stepped ore 2 in whichthe similarly Shaped rear end of the 'propeller shaft 34 is secured bythe hub. At diametrically opposite points, the hub 1 is formed Withrelatively large radial sockets 5 which extend to the-bore 2 i adjacentone of the shouldersga provided pair ofsmaller sockets 6 are formed -insaid ubvat opposite sides of eachgof the sockets 5.'

palr of helical blades 7, are

i with curved inner edges' 8 contactlng4 with provided' Voppositeperipheral portions of the hub 1 and each of. said edges is providedwith a relatively large and long stud 9 and with a pair of smaller studs10, said studs 9 and 10 being received in the sockets '5 and 6 re;spectively. The studs 9 have their inner ends Shaped toI fit against theshaft 3 and said studs are snuglv received in depressions of seats 3bformed in the shoulder 3a. The studs 9 are formed with openings 11which;- aline with longitudinal bores 12' for1ned in the hub 1, screws13 being received in said bores andl openings as clearly shown in Fig.2, for the purpose of holding the blades 7 detachably in place andretaining, the studs 9 in the seats 3b, so that they will key the hub 1toV the shaft 3 and prevent possible relative turning. -If either of theblades'should become damaged, it is an easy matterto remove the properscrew 13 and detach the blade, whereupon a new one may be easilysubstituted. Normally, however.

, the nu't 4 partly covers the screws 13 and prevents accidental removalthereof.

I have found that the best results are obtained by 'circumferentiallyelongating each of the blades 7 for approximately 180, se-

curing said blades to the hub 1 centrally between their ends, andpositioning the outer 'peripheral edges of the blades in concentricrelation -with the axis of said hub.

' In connection with the features above described, I prefer to form aplurality of ports 14 longitudinally through the hub 1' and experiencehas proven that these ports will prevent the propeller from forming avacuum pocket in the water rwhen it is in operation. Thus, much betterresults may be obtained than by the' use of the ordinary propeller and Ihave found that approximately twenty-five per cent power increase isobtained by the use of the Construction r herein disclosed.

On account of the proven 'advantages thereof, the present disclosure maybe considered as the preferred form of my invenf tion, but it is to beunderstood that within the scope of the invention as claimed, numerousmlnor changes may be made.

Luclaim:

with-a plurality of radial sockets, a propeller blade having' its innene Contacting with the outer surface. of sai hub, studs projectinginwardly fromthe ;inner edge of said blade into said sockets, and meansengaging 1. A propeller comprising a hub provided one of said studs tosecure said blade to said hub.

2. 'A propeller comprising a cylindrical lhub having a relatively largeradial socket ing to detachably connect. the blade and hub.

A propeller comprising a hub havingja' shaft receiving bore, a pitchedblade contacting With said hub and having a stud extending through thehub from the periphery of the latter to a point spaced between the axisof said bore and the wall of' the latter, the inner. end of said Studbeing adapted to engage a propeller shaft when the latter is insertedi'n' said bore.

4. A propeller hub having a. longitudinal bore and a radialsocket fromsaid bore to the periphery of the hub, a`pitched blade contacting Withthe hub and having a Stud extendingthrough said radial socket andprojeeting slightly beyond the Wall of said bore, and a Shaft4 securedin said'bore, said shaft having a seat receiving the projecting innermeifiae end of said stud 'to hold the-Shaft andl hub against relativerotation. V

5. A propellerihub having'a longitudinal bore and a radial socket 'fromsaid bore to its periphery, a pitched propeller blade contacting Withthe hub and having a stud projecting throughi said socket and extendingslightly beyond the Wall of the bore, and a Shaft secured in saidbore,said shaft being of two diamters to provide a shoulder at the junctureof such diameters, said shoulder being cut away to form a seat snuglyreceiving the projeeting inner end of the stud to hold the hub and Shaftagainst relative turning. i

:(33. A propeller hub having a longitudinal shaft-receiving bore, and aradial socket opening through its periphery, a pitehed propeller bladehaving a stud received in said socket, said stud and hub having alinedbores, a removable pin received in said alined bores to secure thepropeller blade in place, the rear end of said pin being fiush With therear end of the hub, a propeller Shaft passing through theshaft-reeeiving bore of said hub, and a nut threaded on the rear end ofsaid Shaft, said nut engaging the rear end of said pin to preventaccldental removal thereof. V

In testimony Whereof I have hereunt aflixed my Signature.

JOHN NYLANDER.

